ISPConfig 3 uses a completely different setup with other daemons and especially a much better spamfilter etc. Other daemons might need system resources and also newer versions of the same software like apache, spamassassin and clamav etc. might need more ram. ISPConfig itself does not need any permanent system resources as it is just a script that is run by cron.

I will suggest that the "much better spamfilter" be disabled by default because:
1) it's 3 daemons with their subprocesses use 200+MB of committed memory right out of the box.
2) The amavisd requires fixing just to start it.
3) The content filter is plain stupid! We are a software development company and we had a whole day lost on a project until finding out that it blocks our own email and clients didn't receive their updates that contained zipped exe files (remember software company). Some "much better" programmer has been coding unchecked there.
4) Having an antivirus service on a web server IS BAD DECISION! You can be flooded your performance WILL be hampered when a large attachment is present. Generally content filters are supposed to go on separate servers.

The content filter should be disabled by default and whoever want's it could enable it. It doesn't run out of the box anyway.

The content filter runs out of the box perfectly if the system is installed as described in the perfect setup guide. I'am doing these installations daily and there are > 10 000 installations with ISPConfig out there were it works. So instead of claiming that it does not work gernerally while it just not worked for you, why did you not just asked if you had a problem?

to 3) I work also in a software company and it never blocked any zip file in the last year since we use it, so the question is which settings you use. Amavisd is a widely used spamfilter.

to 4) That was your decision. ISPConfig is a multi server system to separate mail and webserver. If you decide to install web and mailserver on one machine, dont blame the software for it.

So instead of claiming that it does not work gernerally while it just not worked for you, why did you not just asked if you had a problem?

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I've fixed the problem. I was speaking of out of the box which is pretty different thing.

to 3) I work also in a software company and it never blocked any zip file in the last year since we use it, so the question is which settings you use. Amavisd is a widely used spamfilter.

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That's like claiming every crash is survivable because you survived one. Most normal people don't spend their lives tweaking settings. And most admins don't really understand business requirements so this is a problem.

to 4) That was your decision. ISPConfig is a multi server system to separate mail and webserver. If you decide to install web and mailserver on one machine, dont blame the software for it.

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errr that's the ISPC3 forum. Again. Would you be so kind to point me out how to configure a ispc3 cluster? That would be very helpful. But as far as I've read your own comments on people's questions about it the answer was: "It's not implemented." In my understanding "multi server system" means support for multiple servers to be used in one system and not some silly mapping to other single servers.

Sure very hidden ispconfig documentation page I installed a lot of servers with this guide and it works fine for me and many others without any tweaks needed.

errr that's the ISPC3 forum. Remember? Wishful thinking maybe?

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No, just ispconfig 3 statistics. And yes, I know the difference between ispconfig 2 and 3

There are about 300 - 400 ISPConfig 3 downloads per day without the downloads for updates and without downloads for beta and RC releases. So when you claim in your post that ISPConfig setup is not working out of the box in general and it's just silly.

errr that's the ISPC3 forum. Again. Would you be so kind to point me out how to configure a ispc3 cluster? That would be very helpful. But as far as I've read your own comments on people's questions about it the answer was: "It's not implemented." In my understanding "multi server system" means support for multiple servers to be used in one system and not some silly mapping to other single servers.

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The posts talked about mirroring for load balancing and not of running services on different servers like separate mail, web and dns servers what you claimed is not possible. Just select expert mode when you install ispconfig on the second server and you will be asked if the server shall join a master server. I know several ISP's running ispconfig clusters with separated services in production enviroments.